Giant Frictional Drag in Double Bilayer Graphene Heterostructures

Abstract

We study the frictional drag between carriers in two bilayer graphene flakes separated by a 2 $-$ 5 nm thick hexagonal boron nitride dielectric. At temperatures ($T$) lower than $\sim$ 10 K, we observe a large anomalous negative drag emerging predominantly near the drag layer charge neutrality. The anomalous drag resistivity increases dramatically with reducing {\it T}, and becomes comparable to the layer resistivity at the lowest {\it T} = 1.5 K. At low $T$ the drag resistivity exhibits a breakdown of layer reciprocity. A comparison of the drag resistivity and the drag layer Peltier coefficient suggests a thermoelectric origin of this anomalous drag.

5 pages, 4 figures, supplementary material uploaded as an ancillary file

References in corpus (8)

• STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
• Thermoelectric and Magnetothermoelectric Transport Measurements of Graphene
• Strong Coulomb drag and broken symmetry in double-layer graphene
• Gate-Tunable Resonant Tunneling in Double Bilayer Graphene Heterostructures
• Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers
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• Frictional magneto-Coulomb drag in graphene double-layer heterostructure
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• Multiband Mechanism for the Sign Reversal of Coulomb Drag Observed in Double Bilayer Graphene Heterostructures
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• Longitudinal Josephson effect in systems with pairing of spatially separated electrons and holes